Please compute the right answer of the given problem

Question- The following reaction was performed in a sealed vessel at 775^oC :

H₂(g)+I₂(g) = 2HI(g)

Initially, only H₂ and I₂ were present at concentrations of [H₂]=3.40M and [I₂]=2.65M. The equilibrium concentration of I₂ is 0.0400M.

Part 1- What is the equilibrium constant, Kc, for the reaction at this temperature?

I need expert's assistance to find the equilibrium constant for the reaction at given temperature and express your answer numerically.